<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 行内引入 -->
    <button onclick="alert('只因你太美！')">蔡徐坤</button>
</body>
</html>
<script>
    // alert('迎面走来的你让我蠢蠢欲动！')
</script>
<script src="./3.js"></script>